Slate-eraser



(No Model.)

G. WILKENING.

SLATE ERASER.

No. 382,925. r Patented May 15, 1888.

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SLATE ERASER.

SPECIFICATION forming part of Letters Patent No. 382,925, dated May 15,18-88.

Application filed October 14, 1887. Serial N 0. 252.303. (No model.)

To all whom it may concern:

Be it known that I, GOTTLIEB WILKENING, a citizen of the United States,residing at Dayton, in the county of Montgomery and State of Ohio,haveinvented certain new and useful Improvements in SlateErasers; and Ido hereby declare that the following is a full, clear, and exactdescription of the invention, which will enable others skilled in theart to which it appertains to make and use the same, reference being hadto the accompanying drawings, and to the letters of reference markedthereon, which form a part of this specification.

My invention relates to improvements in slateerasers, the sameconsisting of a hollow cylinder, india-rubber reservoir, andaspongeholder, and to the said hollow cylinder is attached a wire claspto hold asponge.

The object of my invention is to supply the erasingsponge from aflexible reservoir which will yield the water necessary for the spongeon making slight pressure.

The device is illustrated in the accompany ing drawings, in which-Figure 1 is a side view of the cylindrical case, the base of thereservoir, a wire clasp on the outside of said case, and a sponge heldtherein. Fig. 2is alongitudinal section of the slate eraser. Fig. 8 isaside view of the flexible reservoir.

Like letters designate like parts throughout the several views.

A is a cylindrical case, formed of tin-plate and open at both ends. Tothe outside of this case is soldered the wire D, the upper free end acylindrical portion adapted to fill the case, and a central orifice atthe top terminating in a shallow cup, the use of which is to hold waterand yield the same on pressure at the top.

B is a piece of round wood, (shown only in section,) which fits looselyin the case. The end is slightly tapering, and on the face of it isattached a piece of sponge, t. The head may be enlarged, and the dottedlines 3' would indicate the position for a dry sponge, if desirable toattach one thereto.

The sponge It would absorb the water raised into the cup of thereservoir by pressure, and this wetted sponge rubbed over the surface ofa slate would efface the marks, and a dry sponge on the opposite endcould be used to dry the same, instead of the sponge 8 held in theclasp, which is used for the purpose as before specified.

Having fully described my invention, what I claim, and desire to secureby Letters Patent, 1s-

1. A slate-eraser comprising a hollow case, a flexible reservoir withflanged base, and an aperture terminating in a cup-at the top, and aholder with sponge attached to the tapering end thereof and suited tohave contact with the cup of said reservoir within said case,substantially'as set forth.

2. The case A, foraslateeraser, having the clasp D on its outside toengage a sponge, and in combination with the reservoir 0 and a suitableholder for an erasing-sponge, substantially as set forth.

3. In aslate'eraser, the holder B, with sponges on both ends, incombination with the flexible reservoir 0 and the case A, substantiallyas and for. the purposes specified. I

In testimony that I claim the foregoing as my own I affiX my signaturein presence of two witnesses.

GOTTLIEB WILKENING.

Witnesses:

B. PIOKERING, SUMNER T. SMITH.

